<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>

    <style>
        body {
            box-shadow: .5rem 1rem 1rem 0 rgba(0, 0, 0, 0.6);
            overflow: hidden;
            color: #333;
            text-align: center;
            background-image: linear-gradient(to top, #191730, #10131d, #19125f, #050e44);
        }
        
        video {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            z-index: 0;
        }
        
        img {
            position: fixed;
            top: 56%;
            left: 41%;
            width: 80px;
            height: auto;
            animation-name: letter;
            z-index: 10;
        }
    </style>
</head>

<body>
    <video src="./static/bg.mp4" autoplay preload muted></video>

    <!-- 信封 -->
    <img src="./static/letter_logo.png">
    <script>
        let letter = document.getElementsByClassName("img")[0];
        letter.addEventListener("click", (e) => {
            alert("ok");
        })
    </script>
</body>

</html>

</html>

</html>

</html>